How to use json input

[cjcenizal]

Per the Kibana 4 blog post:

...JSON input which allows you to specify additional aggregation parameters to send with your request. For example, maybe you want to pass shard_size in a terms agg, or increase the precision_threshold in a cardinality agg.

Here is another concrete example of using a scripted field in this input: Visualize: JSON Input: how to use?